Hey Valentin,
> This part of patch can be added to the style one:
>> "HTTP/2: style and typos."
Assuming that this patch gets dropped or even if it gets committed?
> Is there any practical reason to force this restriction?
None, other than following RFC and providing early detection of broken clients.
Also, it looks that you have a test for it marked as TODO:
http://hg.nginx.org/nginx-tests/annotate/a6abbfed42c0/h2_headers.t#l972
Best regards,
Piotr Sikora